Feature: Add Online order type, external order ID mapping, & online receipt header banner

[khaira777]

Online Aggregator & Web Order Support Request

Extracted from fork anbarasakumar/FloCafe:

Overview

Adds support for taking and processing online orders coming from third-party delivery platforms or online web ordering systems (e.g. Swiggy, Zomato, UberEats, DoorDash, custom web store).

Proposed Changes

1. Order Type & Cart Panel Input:
   • Add online to orderType options (counter, dine_in, takeaway, delivery, online).
   • Add UI inputs in CartPanel.tsx for selecting the online platform name and entering the external order ID.
2. Schema & API Updates:
   • Add external_order_id column to orders table (main/db.ts).
   • Persist external_order_id and onlinePlatform in order creation payload (main/routes/orders.ts).
3. Thermal Receipt Banner:
   • Update receipt encoder (frontend/src/lib/printer/receipt-encoder.ts) to render a prominent "ONLINE ORDER" header banner displaying the platform name and external order ID.
4. Reference Commits:
   • Commits ee0bd53, 5642272, 3a9eec7, fca1af1, 048a2ff in anbarasakumar/FloCafe.

[khaira777]

Verdict: VALID BUT NEEDS RESCOPING — mostly feature completion; the API already accepts online

Findings:

• online is already a valid order type in the API: main/routes/orders.ts:388 (['dine_in','takeaway','delivery','online']). What's missing is the rest of the feature: the UI only offers dine_in/takeaway/delivery (frontend/src/components/pos/CartPanel.tsx:76-80), there is no external_order_id column (orders schema main/db.ts:4154-4189), and no online receipt banner.
• The referenced frontend/src/lib/printer/receipt-encoder.ts exists, but ESC/POS receipts are formatted in main/printers/thermal.ts — a banner must be added in both paths.
• Note OrderFlow (separate repo) handles online-order integration; this issue is the FloCafe-side ingestion surface.

Suggested scope: CartPanel online option + platform/external-order-id inputs; external_order_id column + payload validation in order creation; "ONLINE ORDER" banner in both receipt encoders; tests. Related: none conflicting.